User Agent Parser
Parse any User-Agent string to extract browser, OS, device, engine, CPU, and bot details instantly.
Updated
What is the User Agent Parser?
Parse any User Agent string instantly. Identify browser, operating system, device type, engine, CPU architecture, and detect bots with our free, client-side User-Agent Parser tool.
Get accurate breakdowns for debugging, analytics, web development, and testing. No data leaves your browser.
How it works
Our User-Agent Parser uses a comprehensive set of regular expressions and pattern matching optimized for modern browsers and devices.
Key Detection Features
- Browser & Version: Chrome, Firefox, Safari, Edge, Opera, and more
- Operating System: Windows, macOS, Android, iOS, Linux, Chrome OS
- Device Type: Mobile, Tablet, Desktop, Console, TV, Bot
- Hardware Details: CPU architecture (x64, arm64, etc.)
- Rendering Engine: WebKit, Blink, Gecko, Trident
- Bot/Crawler Detection: Googlebot, Bingbot, and common scrapers
The tool runs entirely in your browser using pure JavaScript. Paste any User-Agent string (from logs, headers, or navigator.userAgent) and receive structured, human-readable results instantly. Results are also available as formatted JSON for easy copying.
This implementation draws from best practices in libraries like UAParser.js while adding enhancements for common real-world use cases and better mobile/tablet distinction.
Examples
Modern Chrome on Windows
Parse a typical desktop Chrome User-Agent
iPhone Safari
Mobile iOS detection
Googlebot
Bot detection example
Frequently asked questions
What is a User-Agent string?
What is a User-Agent string?
A User-Agent (UA) string is an HTTP header that browsers and applications send to websites. It identifies the browser, operating system, device, and version to help sites deliver optimized content.
How accurate is this User-Agent parser?
How accurate is this User-Agent parser?
It accurately handles 95%+ of common desktop, mobile, and bot User-Agents. Like all parsers, it uses pattern matching and may have edge cases with very new or heavily customized UAs. Results are shown transparently.
Can it detect bots and crawlers?
Can it detect bots and crawlers?
Yes. The parser includes detection for popular bots like Googlebot, Bingbot, and many others. It flags them clearly in the results.
Does this tool store my User-Agent data?
Does this tool store my User-Agent data?
No. Everything runs 100% client-side in your browser. No data is sent to any server.
Why do User-Agent strings look so complicated?
Why do User-Agent strings look so complicated?
They evolved over decades without strong standardization. Browsers include compatibility tokens (like "Mozilla/5.0") for legacy reasons, making manual reading difficult.
What should I use this for?
What should I use this for?
Useful for web developers debugging issues, analyzing server logs, testing responsive designs, verifying bot traffic, and building analytics dashboards.
How do I get my own User-Agent string?
How do I get my own User-Agent string?
On most browsers, open Developer Tools (F12), go to the Console tab, and type navigator.userAgent then press Enter.
Is there a limit on User-Agent length?
Is there a limit on User-Agent length?
Yes, strings longer than 2000 characters are rejected for performance and security reasons. Most real User-Agents are much shorter.
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